1313122009 has 2 divisors, whose sum is σ = 1313122010. Its totient is φ = 1313122008.

The previous prime is 1313121989. The next prime is 1313122021. The reversal of 1313122009 is 9002213131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1105762009 + 207360000 = 33253^2 + 14400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313122009 - 2¹¹ = 1313119961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313122709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656561004 + 656561005.

It is an arithmetic number, because the mean of its divisors is an integer number (656561005).

Almost surely, 2^1313122009 is an apocalyptic number.

It is an amenable number.

1313122009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313122009 is an equidigital number, since it uses as much as digits as its factorization.

1313122009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1313122009 is about 36237.0253884063. The cubic root of 1313122009 is about 1095.0527164073.

The spelling of 1313122009 in words is "one billion, three hundred thirteen million, one hundred twenty-two thousand, nine".